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<p>A conjugated polymer was synthesized through oxidative polymerization, and nanocomposite thin-film sensors were developed for hydrogen sulfide (H<sub>2</sub>S) gas detection. The nanocomposite sensors demonstrated remarkable sensitivity, with rapid response times consistently ≤ 1&#xa0;s and faster recovery compared to pure polymer sensors. Nanocomposites of poly(PPD-co-PY) with α-Fe<sub>2</sub>O<sub>3</sub> (PF) and Co-Fe<sub>2</sub>O<sub>3</sub> (PCF) were prepared ex situ using 3% polyvinylidene difluoride (PVDF) as a binder. The nanomaterials were incorporated at weight percentages of 5, 10, and 15%. Among these, the 15% conjugated polymer nanocomposite (PCF) exhibited the highest sensitivity of 1.22, along with excellent response-recovery characteristics. The detection limits were determined to be 9.8&#xa0;ppm for the pure polymer and 5.1&#xa0;ppm for the PCF nanocomposites. The sensors-maintained repeatability over 5 cycles at 2.5&#xa0;ppm H<sub>2</sub>S under ambient conditions, attributed to an increased number of active sites on the sensor surface, enabling efficient gas adsorption and desorption.</p>

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High-performance hydrogen sulfide gas sensors based on conjugated polymer nanocomposites

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • H. S. Rashmi,
  • K. A. Vishnumurthy,
  • Raviraj Kusanur

摘要

A conjugated polymer was synthesized through oxidative polymerization, and nanocomposite thin-film sensors were developed for hydrogen sulfide (H2S) gas detection. The nanocomposite sensors demonstrated remarkable sensitivity, with rapid response times consistently ≤ 1 s and faster recovery compared to pure polymer sensors. Nanocomposites of poly(PPD-co-PY) with α-Fe2O3 (PF) and Co-Fe2O3 (PCF) were prepared ex situ using 3% polyvinylidene difluoride (PVDF) as a binder. The nanomaterials were incorporated at weight percentages of 5, 10, and 15%. Among these, the 15% conjugated polymer nanocomposite (PCF) exhibited the highest sensitivity of 1.22, along with excellent response-recovery characteristics. The detection limits were determined to be 9.8 ppm for the pure polymer and 5.1 ppm for the PCF nanocomposites. The sensors-maintained repeatability over 5 cycles at 2.5 ppm H2S under ambient conditions, attributed to an increased number of active sites on the sensor surface, enabling efficient gas adsorption and desorption.